温度传感温度过程控制

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1、前言温度传感与温度过程控制是一个综合性系统。温度通过模拟温度传感器（热敏电阻）进行采样并转换为电压信号，经放大器放大后用ADC0809模数转换器进行A/D转换成数字量进入AT89C51单片机，从P3.0、P3.1口输出到八段数码管LED静态显示部分显示其温度。采用查询式键盘设定和改变初始值、比较设定值与输入温度值来控制加热，加热器为加热电阻。温度控制系统是比较常见的和典型的过程系统，温度是工业生产过程中重要的被控参数之一，在冶金、机械、食品、化工等各类工业生产过程中广泛使用的各种加热炉、热处理炉、反应炉，对工件的处理温度等均需要对温度严格控制。当今计算机控制技术在这方面的应用，已使温

2、度控制系统达到自动化、智能化，比过去单纯采用电子线路进行PID调节的控制效果要好的多。本设计是针对MCS—51型89C51系列单片机在检测和控制方面的应用，分析温度控制系统实际。在设计中，首先介绍了一下在设计中用到的一些重要芯片，如AT89C51、AD0809、74LS164等，使读者在阅读过程中，对各个芯片的具体功能更加清晰；在温度采集电路设计中，以大量的篇幅介绍了温度采集与数据变换过程、LED数码管显示接口，并将设计的流程图、源程序及电路图有序的列出，给人一种明了的感觉；由于编者水平有限，加上时间仓促，设计中难免有不妥，请老师们批评指正，在此向老师们表示感谢。-43-/43目录前

3、言·····························································1设计说明·························································3一、芯片介绍······················································4AT89C51介绍······················································5AD0809介绍·····································

4、···············1274LS164介绍····················································14二、单片机的时钟电路·············································14三、复位电路和复位状态··········································15四89C51单片机的最小应用系统···································18五、温度采集控制系统设计······································

5、···18１温度传感器的分类和应用········································18２逻辑输出型温度传感器··········································19３数字式温度传-43-/43感器··············································204温度控制系统结构图·············································215常用外围设备接口电路···········································216LED

6、数码管显示接口···········································22六、温度过程控制系统设计·········································30１键盘接口···················································30２键盘扫描控制方式·············································32３　流程图及源程序···············································334电路图············

7、············································38总结·····························································40-43-/43设计说明关键字:单片机、A/D转换器、芯片、AT89C51、AD0809、74LS164本设计是模拟温度的显示，温度经过热敏电阻转换为电压信号，经放大器放大后进入单片机进行A/D转换成数字量后输出到静态显示部分，显示其温度值